Improvement in liquid-meters



' ttiterlf time @met (tilllate WILHELM FISCHER, OF ESSEN, PRUSSIA, ASSIGNOR TO FISCHER & STIEHL OF SAME PLACE. I

Letters Patent No. 107,763, dated September 27, 1870;

IMPRovEMENT- mimmo-METERS.

The Schedule referred to in these Letters Patent and making part ofthe same.

To allwhom tt may concerne:

" Beit known that I, WILHELM FISCHER, of Essen, in the kingdom of Prussia, have invented a new and useful Improvement in Fluid-Meters, of which the following is a full, clear,4 and exact description, referi ence being had to the accompanying drawing forming mentis mainly designed to be used for measuring the quantity of heated feed-water passing tof a steam- Aboiler,'tor the purpose of ascertaining the amount of heat communicated to the boiler by the fire, such ,heat being represented by the amount required to warm the feed-water to the temperature of the steam in the boiler, and the 4amount of heat requisite to evaporate said water.

2 .To this end it is necessary to connect the meter with apparatus for heating the feed 'water in its passage to the former, by steam from the boiler, to' a like temperature with the steam, and to connect the meter with the boiler, so that the water in issuing from 'the `meterris discharged as an overilow into the boiler, but as such apparatus is independent of the meter proper,

' and not shown in this application, the description will here be restricted to the meter-,either as applicable for the purpose specified, or for any other to which it may be suitable as a luid-measnreix rIhe invent-ion relates to that description of meters in which the fluid, as it passes through the meter, is made to act upon a series of spiral blades secured to a cylinder hung so as to be capable of rotation; and

The invention consists inaccrtain arrangement and combination of a supply or inlet-spout, a revolving horizontal drum, having the spiral blades arranged peripherically within it, and of close construction at its inlet end, but of open construction at its opposite end, and a chamber or box, into which the fluid as it issues from the drum escapes, and Within the duid contained in which the drum forthe lower portion of its travel revolves, the fluid contained in said box or chamber being kept at a uniform level, by causing allA surplus to pass oil' as an overflow to the boiler, which gives steadiness and accuracy to the' rotation of the drum.

Referring to the accompanying drawing- A represents the horizontal revolving drum, hung upon ashaf't, a, which is suportedin suitable end bearings, and whichis designed to be connected with registering mechanism of any proper description.

This drum is closed at its inlet, and, excepting at its center, ,where an inlet-branch, sleeve or spout, B,

is made to enter the same, or project through it, 'and which may connect with a vertical trough, C, that acts as a primary receiver for the fluid to the meterthc outlet end ot' the drum is left open, and its invterior peripherical surface provided with any desired number of spiral wings D, by which the fluid, as it passes through the drum, communicates rotary motion to the latter.

Said drum A is immersed for a considerable portion of its diameter, not, however, exceeding one-half thereof', in a iluid box or chamber, E, that is supplied with fluid from the outlet end of the drum, and which operates as an overflow to establish the necessary supply the meter` is designed to elTect. In this way, asteady and accurate motion is secured to the drum,v by reason ot' the latter not only containing a fixed quantity ot' tluid in its lower portion, but also rotating in ari-external body of fluid maintained at a uniform level within the chamber E.

In the operation ofthe met-er, the quantity of fluidl passed is determined by thev rotation of thevdrnm, which may have any suitable registering mechanism connected with it, the tluid, as it. is discharged from the drum, serving to steady the run ol' the latter, by first entering the box E, and maintaining at a xed level or depth of fluid therein, and afterward passing o" as au overllow from said box or chamber.

W'hat is here claimed, and desired to be secured by Letters Patent, is-

'lhe combinationv and arrangement, substantially as specified, of the horizontal revolving drum A, of close construction at its inlet end, but open at its outlet end, and provided with internally disposed spiral wings D, the inlet branch or spout B, and the overflow chamber E.

' WILHELM FISCHER. lVitnesses:

GUsTAv RnnNznn, S. HIRscHLArD. 

